Good battery test results here: http://mynokiablog.com/2009/12/12/fu...3g-connection/

That guy got 3.5 hours talk time. Most of that time the display would be off. Realistically, browsing power load is not less then talk, but more, since its likely the CPU is doing work, and the display is on.

Like I said before, you can count on 3 hours of fully powered up and running time (ie, data link or wifi, screen on, cpu humming along) or about 450ma average power load, which get you to 1350mah total capacity used in 3 hours.

If you've got IM or some other network connected process running all the time, the device will do its best to keep the actual duty cycle down to some smaller % of fully on, such that your average load is in the low 100s or even high double digits. "Standby" load where its powered up and able to receive a call should be under 50ma for ~27 hours between charges.

if you're running even 10% of the time fully powered up (again, I am guessing 450ma as its probably in the ball park) then you're drawing (450*6 + 50*54)/60=90ma/hour on average, for 15 hours total run time.

Add in an hour or so of actual full time use (some email, some surfing, for example) and your total time between charges is now 11 hours (1 hour at 450ma, leaving 900mah, or 10 hours.)

My actual usage falls in the range of 11-15 hours off charger so my usage pattern is between those two cases.

Use it for a couple hours, and you've got 900mah used, 450mah left for "idle" @ 90ma, or 5 more hours, for 7 hours total. For example, you talk for an hour, and browse/email/im/whatever on network for an hour, your n900 will be out of gas after 7 hours total off charger.

I think these are fairly typical of all high end devices. It tracks exactly with the HTC VGA or bigger CDMA devices I've used, and it matches the iPhone 3G as well.